From a tank filled with 240 gallons of alcohol, 60 gallons are drawn off and the tank is filled up with water. Then 60 gallons of the mixture are removed and replaced with water, and so on. How many gallons of alcohol remain in the tank after 5 drawings

From a tank filled with 240 gallons of alcohol, 60 gallons are drawn off and the tank is filled up with water. Then 60 gallons of the mixture are removed and replaced with water, and so on. How many gallons of alcohol remain in the tank after 5 drawings of 60 gallons each are made?